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excited state: state in which an atom or molecule picks up outside energy, causing an electron to move into a higher-energy orbital.
What is an Electron ? What is an electron ? is a question that can be answered at various levels of detail and complexity, depending on the context. This page describes electrons at the the level required for high school chemistry (GCSE to A-Level in the UK). Definition of an Electron: An electron is a subatomic particle that has a negative charge of -1 and is located in the volume of atoms around the nucleus (so not in the nucleus itself) Electrons have no known components or substructure and are therefore generally considered to be elementary particles.